This is how I installed magnets in my setup. They are 1/8"dia. and about 1/4" long. These are RCV91CD thrust washer/bearing for my KMP B25, will not be using spinner so had to go this route. Works great. As the washer has a machined opening around the circumference of the bearing, it lends itself nicely to this installation. The sensor picks up the magnets up to 1/4" from the outer circumference of the bearing so there is room to work with. And there is no problem with the prospect of losing a magnet at high RPM due to centrifugul force should the bonding agent fail, which would not be good. No way this magnet gets out of there.

You just need to orient the magnets for the correct polarity as the magnetic field is generated from the sides of these magnets rather than the ends. Test with the sensors for correct alignment before gluing in. The magnets are available from Bill Wike whom I forgot to mention initially, he has posted his email address just 2 posts after this post.

Used JB weld to keep in place, balanced the thrust washers/bearing by removing a small amount of material via 1/8" bit next to the magnet.

Jim